3 views

Consider the CMOS circuit shown, where the gate voltage $V_{G}$ of the n-MOSFET is increased from zero, while the gate voltage of the p-MOSFET is kept constant at $3 \mathrm{~V}$. Assume that, for both transistors, the magnitude of the threshold voltage is $1 \mathrm{~V}$ and the product of the transconductance parameter and the (W/L) ratio, i.e. the quantity $\mu C_{o r}(\mathrm{~W} / \mathrm{L})$, is $1 \mathrm{~mA} \cdot \mathrm{V}^{-2}$.
Estimate the output voltage $V_{0}$ for $V_{G}=1.5 \mathrm{~V}$. [Hint: Use the appropriate current-voltage equation for each MOSFET, based on the answer to Q. $57.]$
1. $4-\frac{1}{\sqrt{2}} \mathrm{~V}$
2. $4+\frac{1}{\sqrt{2}} \mathrm{~V}$
3. $4-\frac{\sqrt{3}}{2} \mathrm{~V}$
4. $4+\frac{\sqrt{3}}{2} \mathrm{~V}$